24-grit discs are the matching item to 24-grit belts on the drum sander. If you had to sand the middles of your floor with 24-grit on the drum, you will most definitely need 24-grit to sand the edges. This is a coarse mineral; it is designed to hold shellac, lacquer, or polyurethane so it can be removed from your floor but is NOT designed to sand wood to bare. 24-grit should leave just enough finish on your floor that the next grit, 36, can make the wood completely clean of finish. 24-grit is an important link in the chain of the grit sequence; it cannot be used just by itself.
Mineral: silicon carbide
Bolt-on style disc with 7/8” center hole